CVE-2021-32846

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Source

https://cve.org/CVERecord?id=CVE-2021-32846

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32846.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2021-32846

Published

2023-02-17T23:15:12.037Z

Modified

2026-04-11T17:25:59.184923Z

Severity

7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator

Summary

[none]

Details

HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107, function pci_vtsock_proc_tx in virtio-sock can lead to to uninitialized memory use. In this situation, there is a check for the return value to be less or equal to VTSOCK_MAXSEGS, but that check is not sufficient because the function can return -1 if it finds an error it cannot recover from. Moreover, the negative return value will be used by iovec_pull in a while condition that can further lead to more corruption because the function is not designed to handle a negative iov_len. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit af5eba2360a7351c08dfd9767d9be863a50ebaba.

References

Affected packages

Git / github.com/moby/hyperkit

Affected ranges

Type

GIT

Repo

https://github.com/moby/hyperkit

Events

Introduced

Last affected

40cbd5caa9580e2b6de8fef53f4581943c430312

Fixed

af5eba2360a7351c08dfd9767d9be863a50ebaba

Database specific

{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "0.20210107"
        }
    ]
}

Affected versions

v0.*

v0.20170214

v0.20170227

v0.20170425

v0.20170511

v0.20170519

v0.20170904

v0.20171020

v0.20171204

v0.20180621

v0.20190201

v0.20190802

v0.20200224

v0.20200908

v0.20210107

Database specific

vanir_signatures_modified

"2026-04-11T17:25:59Z"

vanir_signatures

[
    {
        "source": "https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba",
        "target": {
            "function": "pci_vtsock_proc_tx",
            "file": "src/lib/pci_virtio_sock.c"
        },
        "id": "CVE-2021-32846-b09d9f98",
        "signature_type": "Function",
        "signature_version": "v1",
        "deprecated": false,
        "digest": {
            "function_hash": "125994073580106480435013042924630844270",
            "length": 5340.0
        }
    },
    {
        "source": "https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba",
        "target": {
            "file": "src/lib/pci_virtio_sock.c"
        },
        "id": "CVE-2021-32846-eb6585cd",
        "signature_type": "Line",
        "signature_version": "v1",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "118801894192246387531295740415707816522",
                "210678114142392592887100980302801274153",
                "216889802229094579609416855703020175875",
                "303809023214414299997951559145263804521"
            ],
            "threshold": 0.9
        }
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32846.json"